Biology:Galeactena
Galeactena is an extinct genus of Scleroctenophoran comb jellies (Ctenophora) that lived during the early Cambrian period as a member of the Chengjiang biota. This genus only contains one species, Galeactena hemispherica, making it monotypic.[1][2][3]
It was a planktonic genus drifting through the ocean and filter feeding.[4]
Description
The anatomy of Galeactena is globose bearing resemblance to an upside-down garlic bulb. All specimens of Galeactena have a consistent vaulted hemispherical shape with little evidence of its body being twisted or distorted. It has eight rows of cilia which it uses to propel through the water.[1][5] The body of Galeactena and its apical organ is supported by a external organic skeleton.[6]
Taxonomy
This genus is a member of the taxonomic class Scleroctenophora making it related to genera such as Batofasciculus. However it was most closely related to genera such as Maotianoascus.[1][2]
References
- ↑ 1.0 1.1 1.2 "Science" (in en). doi:10.1126/sciadv.1500092. https://www.science.org/action/cookieAbsent.
- ↑ 2.0 2.1 "WoRMS - World Register of Marine Species - Out of scope". https://marinespecies.org/aphia.php?p=taxdetails&id=867239.
- ↑ "Galeactena". https://www.gbif.org/taxon/7PGFG.
- ↑ "600-million-year-old fossils that reveal the world’s first animals – Museum Crush" (in en-GB). 2019-05-28. https://museumcrush.org/600-million-year-old-fossils-that-reveal-the-worlds-first-animals/.
- ↑ "Galeactena hemispherica — Chris Otley" (in en). https://chrisotley.com/Galeactena-hemispherica.
- ↑ Zhao, Yang; Vinther, Jakob; Parry, Luke A.; Wei, Fan; Green, Emily; Pisani, Davide; Hou, Xianguang; Edgecombe, Gregory D. et al. (2019-04-01). "Cambrian Sessile, Suspension Feeding Stem-Group Ctenophores and Evolution of the Comb Jelly Body Plan" (in English). Current Biology 29 (7): 1112–1125.e2. doi:10.1016/j.cub.2019.02.036. ISSN 0960-9822. PMID 30905603. https://www.cell.com/current-biology/abstract/S0960-9822(19)30206-4.
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